聚對苯二甲酸乙二酯結晶行為－熱歷史效應

Crystallization of Poly(ethylene terephthalate)

許嘉慧(Hsu Chia-Hui)

指導教授 ： 余子隆

元智大學/工程學院/化學工程與材料科學學系/碩士(2003年)

摘要

無資料

關鍵字

聚對苯二甲酸乙二酯 ； 偏光顯微鏡 ； 馬爾它十字 ； 正負型球晶

並列摘要

Crystallization of poly (ethylene terephthalate)(PET) was studied using optical microscopy under various thermal history. The PET sample was melted at 300℃ with different heating time (10 min, 8min, and 5min), then cooled to different crystallization temperature（180℃~230℃）using various cooling rates（100℃/min, 50℃/min, and 20℃/min）. The experimental results revealed that the crystalline of PET crystallized at a lower crystallization temperature were positive and usual spherulites. At a higher crystallization temperature, mixture of positive and negative and unusual twisted spherulites were observed. With shorter melting time at 300℃, the Tc for the mixture of positive and negative and unusual twisted spherulites to appear will decrease. With slow cooling rate, the induction time for PET spherulite start to growth will be reduced at Tc＝230℃. The twist spacing of spherulites increased with increasing crystallization temperature. At the same Tc, The twist spacing increased with increasing cooling rate.

並列關鍵字

Poly (ethylene terephthalate) ； POM ； Maltese cross ； positive and negative spherulites ； twisted spherulites

參考文獻

l Antwerpen F. V. and Krevelen D. W.，“Light-scattering method for investigation of the kinetics of crystalliztion of spherulites”， J. Polym. Sci.， 10，2423(1972)

l Alamo R. G. and Mandelkern L.， Macromolecules， 24， 6480(1991)

l Al Raheil I. A. M.， “Morphology and crystallization of PET”， Polymer International， 35， 189(1994)

l Bhatt G. M.， Bell J. P.， and Knox J.R.，J. Polym. Sci. Polym. Phys. Ed.，14，373(1976)

l Bornschlegl E. and Bonart R.，Colloid Polym. Sci.，258，319(1980)